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Vacuum Insulation Panel: Evaluation of Declared Thermal Conductivity Value and Implications for Building Energy

Author

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  • Fred Edmond Boafo

    (Green Energy Technology Research Center, Kongju National University, Cheonan 31080, Republic of Korea)

  • Jin-Hee Kim

    (Green Energy Technology Research Center, Kongju National University, Cheonan 31080, Republic of Korea)

  • Jong-Gwon Ahn

    (Green Energy Technology Research Center, Kongju National University, Cheonan 31080, Republic of Korea)

  • Sang-Myung Kim

    (Zero Energy Buildings Laboratory, Graduate School of Energy Systems Engineering, Kongju National University, Cheonan 31080, Republic of Korea)

  • Jun-Tae Kim

    (Department of Green Smart Architectural Engineering, Kongju National University, Cheonan 31080, Republic of Korea)

Abstract

Policymakers regularly implement stricter building energy-efficiency codes towards curtailing building energy use. Inevitably, super-insulating materials such as Vacuum Insulation Panels (VIPs) are essential to satisfy such codes. VIPs have been applied to buildings for over two decades now, with many lessons learned. Generally, the thermal conductivity values of VIPs often reported in the literature are the center-of-panel thermal conductivity ( λ cop ) and effective thermal conductivity ( λ eff ), factoring thermal bridges. However, there are other indexes, such as λ 90/90 (declared value in the 90% percentile with a confidence of 90%) and λ cop,90/90,aged (factoring aging), that increase consistently and reliably in the declared thermal conductivity value for VIPs. These indexes are scarcely computed and hardly reported. The main aim of this study was to examine the different declared thermal conductivity values of VIP-based guidelines, such as draft ISO DIS 16478, and evaluate their implications on annual building energy consumption. The main study constitutes four parts: (1) experimental evaluation of the thermal properties of pristine and aged VIP samples, (2) computation of thermal conductivity indexes, (3) numerical investigation of thermal conductivity indexes based on a reference building, and (4) related building energy implications. The mean λ cop for 10 VIP samples was 0.0042 W/(mK) and increased to 0.0073 W/(mK) for λ 90 / 90 , bridge, aged. Results show a significant bearing on building energy performance of as much as 2.1 GJ.

Suggested Citation

  • Fred Edmond Boafo & Jin-Hee Kim & Jong-Gwon Ahn & Sang-Myung Kim & Jun-Tae Kim, 2023. "Vacuum Insulation Panel: Evaluation of Declared Thermal Conductivity Value and Implications for Building Energy," Energies, MDPI, vol. 16(15), pages 1-15, August.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:15:p:5841-:d:1212150
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    References listed on IDEAS

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    1. Sihyun Park & Bo-Hye Choi & Jae-Han Lim & Seung-Yeong Song, 2014. "Evaluation of Mechanically and Adhesively Fixed External Insulation Systems Using Vacuum Insulation Panels for High-Rise Apartment Buildings," Energies, MDPI, vol. 7(9), pages 1-23, September.
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